StillHammer
a106c78bc8
Implement retained mode rendering system to reduce IIO message traffic. Widgets now register render entries that persist across frames and only publish updates when visual state changes. Core changes: - UIWidget: Add dirty flags and render ID tracking - UIRenderer: Add retained mode API (registerEntry, updateRect, updateText, updateSprite) - SceneCollector: Add persistent sprite/text storage with add/update/remove handlers - IIO protocol: New topics (render:sprite:add/update/remove, render:text:add/update/remove) Widget migrations: - UIPanel, UIButton, UILabel, UICheckbox, UISlider - UIProgressBar, UITextInput, UIImage, UIScrollPanel Documentation: - docs/UI_RENDERING.md: Retained mode architecture - modules/UIModule/README.md: Rendering modes section - docs/DEVELOPER_GUIDE.md: Updated IIO topics Performance: Reduces message traffic by 85-97% for static/mostly-static UIs 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
119 lines
4.9 KiB
Markdown
119 lines
4.9 KiB
Markdown
# GroveEngine - Claude Code Context
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## Project Overview
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GroveEngine is a C++17 hot-reload module system for game engines. It supports dynamic loading/unloading of modules (.so) with state preservation during hot-reload.
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## Documentation
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**For developers using GroveEngine:**
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- **[DEVELOPER_GUIDE.md](docs/DEVELOPER_GUIDE.md)** - Complete guide to building applications with GroveEngine (modules, IIO topics, examples)
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- **[USER_GUIDE.md](docs/USER_GUIDE.md)** - Core module system, hot-reload, IIO communication basics
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**Module-specific:**
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- **[BgfxRenderer README](modules/BgfxRenderer/README.md)** - 2D rendering module (sprites, text, tilemap, particles)
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- **[InputModule README](modules/InputModule/README.md)** - Input handling (mouse, keyboard, gamepad)
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- **[UIModule README](modules/UIModule/README.md)** - User interface system (buttons, panels, scrolling, tooltips)
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- **[UI Rendering](docs/UI_RENDERING.md)** - Retained mode rendering architecture
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## Available Modules
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| Module | Status | Description | Build Flag |
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|--------|--------|-------------|------------|
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| **BgfxRenderer** | ✅ Phase 7-8 Complete | 2D rendering (sprites, text, tilemap, particles) | `-DGROVE_BUILD_BGFX_RENDERER=ON` |
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| **UIModule** | ✅ Phase 7 Complete | UI widgets (buttons, panels, scrolling, tooltips) | `-DGROVE_BUILD_UI_MODULE=ON` |
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| **InputModule** | ✅ Production Ready | Input handling (mouse, keyboard, SDL backend) | `-DGROVE_BUILD_INPUT_MODULE=ON` |
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**Integration:** All modules communicate via IIO topics. See [DEVELOPER_GUIDE.md](docs/DEVELOPER_GUIDE.md) for complete IIO topics reference.
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## Build & Test
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```bash
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# Build core only
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cmake -B build && cmake --build build -j4
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# Build with all modules
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cmake -B build -DGROVE_BUILD_BGFX_RENDERER=ON -DGROVE_BUILD_UI_MODULE=ON -DGROVE_BUILD_INPUT_MODULE=ON
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cmake --build build -j4
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# Run all tests (23+ tests)
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cd build && ctest --output-on-failure
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# Build with ThreadSanitizer
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cmake -DGROVE_ENABLE_TSAN=ON -B build-tsan
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cmake --build build-tsan -j4
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```
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## Architecture
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### Key Components
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- **ModuleLoader**: Handles dlopen/dlclose of .so modules with hot-reload support
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- **SequentialModuleSystem**: Single-threaded module execution for testing
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- **IntraIOManager**: Inter-module communication with pub/sub routing
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- **TopicTree**: O(k) topic matching with wildcard support
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### Thread Safety Patterns
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See `docs/coding_guidelines.md` for detailed synchronization guidelines.
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**DO:**
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```cpp
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// Multiple mutexes - use scoped_lock (deadlock-free)
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std::scoped_lock lock(mutex1, mutex2);
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// Read-heavy data - use shared_mutex
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std::shared_lock readLock(sharedMutex); // concurrent reads
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std::unique_lock writeLock(sharedMutex); // exclusive write
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```
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**DON'T:**
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```cpp
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// NEVER nest lock_guard - causes deadlock
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std::lock_guard lock1(mutex1);
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std::lock_guard lock2(mutex2); // DEADLOCK RISK
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```
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### ModuleLoader Usage
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- Each `ModuleLoader` instance manages ONE module lifecycle
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- Don't reuse loader for multiple independent modules (causes SEGFAULT)
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- `reload()` safely handles state extraction and library reload
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- `load(path, name, isReload=true)` for hot-reload with cache bypass
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## Known Issues
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- **TankModule.h linter bug**: A linter sometimes merges lines 35-36. If build fails with "logger not declared", check this file.
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## Test Categories
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| Test # | Name | Duration | Description |
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|--------|------|----------|-------------|
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| 1-10 | scenario_* | ~0.01s | Basic scenarios |
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| 11 | ProductionHotReload | ~12s | Full hot-reload cycle |
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| 12 | ChaosMonkey | ~41s | Stress testing |
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| 13 | StressTest | ~180s | Heavy load |
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| 15 | MemoryLeakHunter | ~135s | 200 reload cycles |
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| 19 | CrossSystemIntegration | ~4s | Multi-system test |
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## Module Architecture Quick Reference
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### BgfxRenderer
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- **RHI Layer**: Abstracts bgfx calls (`RHIDevice.h`, `BgfxDevice.cpp`)
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- **RenderGraph**: Topological sort with Kahn's algorithm for pass ordering
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- **CommandBuffer**: Records commands, executed by device at frame end
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- **IIO Topics**: `render:sprite`, `render:text`, `render:tilemap`, `render:particle`, `render:camera`, `render:clear`, `render:debug/*`
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### UIModule
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- **UIRenderer**: Publishes render commands to BgfxRenderer via IIO (layer 1000+)
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- **Widgets**: UIButton, UIPanel, UILabel, UICheckbox, UISlider, UITextInput, UIProgressBar, UIImage, UIScrollPanel, UITooltip
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- **IIO Topics**: Consumes `input:*`, publishes `ui:click`, `ui:action`, `ui:value_changed`, etc.
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### InputModule
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- **Backends**: SDLBackend (mouse, keyboard, gamepad Phase 2)
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- **Thread-safe**: Event buffering with lock-free design
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- **IIO Topics**: `input:mouse:*`, `input:keyboard:*`, `input:gamepad:*`
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## Debugging Tools
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```bash
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# ThreadSanitizer (detects data races, deadlocks)
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cmake -DGROVE_ENABLE_TSAN=ON -B build-tsan
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# Helgrind (alternative deadlock detector)
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cmake -DGROVE_ENABLE_HELGRIND=ON -B build
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make helgrind
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```
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